Waterproof magnetic chuck



WATERPROOF MAGNETIC CHUCK Filed Jan. 2,7, 1920 mmm 3. Sheetg-Shnt 1 Sept. 22, 1925.

F L. SIMMONS WATERPROOF MAGNETIC CHUCK Filed Jan. 27, 1920 3 Sheets-Sheet 2 Umm )TAMA @16 @VC-boina? sept. 22, 1925. A 1,554,235

F. L. SIMMONS WATERPROOF MAGNETIC CHUCK Filed Jan. 27, 1920 3 ShoetggSheot 3 j @mum/01,

' MA. Sal/mm Patented Sept. 22, 1925.

UNITED STATES 1,554,236 PATENT OFFICE.

FRANK L. SIMMONS, OF WOONSOCKET, RHODE ISLAND, ASSIGNOR TO THE TAFT- PEIROE MANUFACTURING COMPANY, 0F WOONSOGKET, RHODE ISLAND, A COR- PORATION OF RHODE ISLAND.

WATERPROOF MAGNETIC CHUCK.

Application filed. January 27, 1920. Serial No, 354,506.

To all whom it may concern:

Be it knownfthat I, FRANK L. SIMMONS, a citizen of the United States, residing 'at Viloonsocket, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in TWaterproof Magnetic Chucks, of which the following is a specification.

This -invention relates broadly to electrical apparatus, and more specifically to a waterproof magnetic chuck.

One of the'principal objects of the present invention is a magnetic chuck constructed in such manner as to be completely waterproof and preferably without air gaps in the chuck construction.

Another object of the present invention is a magnetic chuck constructed without air gaps or voids in such manner that substantially the entire body of the chuck is iilled with solid material.

Another object of the present invention is a magnetic chuck having the several elements of the chuck embedded in and supported by a phenol condensation insulating material in such manner that the entire body of the chuck is one solid mass of material. e

A further object of the invention is a magnetic chuck having the pole pieces and coils embedded in a unitary piece of solid insulating material n'iolded around the several parts of the chuck.

A still further object of the present invention is a magnetic chuck of the character specified wherein all of the several elements of the chuck are embedded in a phenol c ondensation product such as condensite, bakelite or the like.

Another object of the present invention is a magnetic chuck wherein the voids between the elements of the chuck are lilled by a heat hardened compound forced into the chuck under pressure.

A still further object of the present invention is a magnetic chuck having a plurality of face plate pole pieces arranged side by side with the sides of certain of said pole pieces composed of curved lines and the sides of adjacent pole pieces composed of straight lines.

A still further object of the present invention is a magnetic chuck having the electrical wiring embedded in and supported by an insulating compound.

lIn view of the fact my invention may be mbodied inmany different structures, I desire the specific constructions herein described and shown shall be considered as illustrative and not in the limiting sense.

Throughout the drawings forming a part of this specification like parts are designated by like characters.

Figure l is a plan view of a chuck made in accordance with the present invention.

Figure 2 is a sectional elevational view taken on line A-A of Figure l.

Figure 3 is a transverse cross-sectional view taken on line B-`B, Figure 1.

Figure l is a transverse cross-sectional view taken on line C-C.

Figure 5 is a detail section of a portion of the front of the chuck showing the connectors for the coils. l

Figure 6 is a front elevational view of the detail shown in Figure 5 and showing in dotted lines one pair of connecting arms removed.

Heretofore in the art it has been customary to manufacture magnetic chucks by as` sembling face plate pole pieces in'the desired arrangement, then filling the spaces between the pole pieces with a suitable nonmagnetic material, usually Babbitt metal oi the like, which could be pounded or penned between the poles in order to try to secure a watertight joint between the face plate pole piecesl/Vatertight joints are desirable because magnetic chucks are frequently used for wet grinding or for other purposes where the chuck is submerged in water or `grinding fluids. It has been found that the Babbitt metal joint cannot be relied upon to be absolutely watertight and therefore it has beencustomary to use a thin plate of tin or brass positioned directly under the face plate pole pieces and forming the cover for the body of t-he box which contains the electric coils, etc. This plate interferes with the Itransmission of magnetism to the face plate pole pieces and it sometimes happens that water will leak in under this plate. When water leaks into the housing of a chuck, there is great liability of short circuits which may destroy the chuck and do other electrical damage.

CII

ln the manufacture of chucks there is also ot necessity suitable connections between coils, and wires connectingv the coils with suitable outlet boxes, etc. lecause oli more or less limited space it is customary to leave these wires tree, and it sometimes happens that in the handling, otl chucks these wires move about and may either become loosened or the insulation may become abraded or broken, and short and open circuits occur 'tor this reason.

Magnetic chucks are now being used with heavy duty machines and the result is that there is a tendency tor the individual elements or the chuck to work loose and again, this tends to open up the seams and eventually cause the destruction oit the chuck.

The present invention overcomes the diiiiculties oi the known art by providing a magnetic chuck which is one solid mass ot material from the face plate through to the back plate and wherein all the Vvoids ordinarily to be found in the chuck are filled with a waterproof compound of suiiicient hardness and strength to prevent movement ot the part-s under the most severe usage;

The preferred construction utilized in carrying out the present invention comprises a chuck wherein all of the space in the chuck other than that occupied by the metal parts, is vlilled with al phenol condensation product such as condensite or bakelite, and which, thereiore, embeds and encloses the coils, the pole pieces, and the wiring` in such manner that the whole chuck is solid. A chuck ilforincd in this manner possesses great strength, is absolutely waterproof, and is ot high economy and eliiciency because of the line insulating qualities oit these compounds.

Furthermore, the chuck is exceedingly economicalto manufacture since the expensive operation of mounting' up the tace plate and carefully pounding each line oft metal, as was 'followed in the prior art, is entirely eliminated.

Referring now more particularly to the drawings, which disclose one form embodyingl my invention, a magnetic chuck is illustrated as comprising a shell formed of side walls l and pole pieces 2 integral with the side walls. These pole pieces extend across the top ot the chuck or rather extend between the openings in the top ot the chuck. (lore pole pieces 4 are provided on their upper ends with tace plate pole pieces 5 which extend through the, 'openings in the top member and are spaced apart from the poles 2 ot the top member, Preferably there are a plurality of pole piece members where the chuck manufactured is a. long* chuck, and each of these core piece members is adapted to carry an energizing; coil 6. rThese enerl gizing coils are preferably wound to be used upon predetern'iined voltage, for example,- llO volts, and theterminals of these coils,

as will later be specifically explained, are adapted to be so constructed and arranged that they may be connected either in series or in parallel, so that when the coils are connected in parallel, the chuck is adapted 'for use on a 1l() volt circuit. and when the coils are connected in series the chuck is adapted for use on a 2Q() voit circuit.

In manufacturing this chuck the core pole pieces are set within the shell or housing l with the tace plate pole pieces 5 extending tl'irough the openings between the shell pole pieces 2 and with the parts so arranged they may be mounted on a suitable chuck, it'or example, sonic other magnetic chuck, and the work tace or' both sets ot poles ground or machined to a common plane. The parts may then be reversed and the back ot the parts brought to a common plane.

fatter the parts have been assembled as specified with the coils G on the core pole pieces fl, a suitable back plate 7 is secured to the core pole pieces l and to the housing l, by means ot stub screw bolts 8 so that the parts are deiinitely and lixedly positioned. The interior ot the chuck is now lillcd with a suitable insulating` con'ipotnid 9 so that the entire chuck comprises a substantially solid mass of material. This insulating con'iponnd 9 may comprise a body ot bakclite 9 which completely surrounds the coils (E and also extends between and separates the tace plate pole pieces 2 and 5.

lic'l'ei ring,` to Figures 5 and (i, the ends l() and ll of the lcoils G are connected (preterably soldered) with suitable hexagonal lnass s-'riiv threaded bodies l2. rthe bakelite' material -l'ornis a support 'l'or these brass coiincctms and the bakelitc is molded lo l'orni a suitable connector block 'let by perinitlinp,l the bakelitc to extend through an opening in the side wall ol the shell l. The connector arms 8 and i3 are connected with the terminals l0 and ll respectively by means ot stub screws set in the hexagonal brass members. Suitable screw bolt openings l5 are also provided adjacent the connector p cket tor the reception ot mounting screws tor a suitable terminal cover l0 indica* .e in Figure in dotted lines.

lh'eterably certain oi" the tace plate pole pieces shown in Figure l ire provided with edges presenting,V a wave-like appearance, wh..h edges are adjacent the substantially straight edges of the adjacent pole pieces and preferably these wavy edo', separation lines between the pole pic are evenly; spaced over the Ytace ot the chuck with straight line edges between them. This construction has advantages in that the wavy lines tend to strongly resist the sliding ot the work across the 'taco ot the chuck when the chuck is energized, whereas the straight lines strongly resist the movement oft work lengthwise of the chuck when the chuck is All) energized. By these two coniigurations of lines of magnetic torce a iield of great holding power in both directions is obtained.

F rom the `foregoing it is evident that the chuck constructed in accordance with the present invention will be exceedingly rigid, and will withstand severe treatment and at the same time is thoroughly waterproof and the possibility of water reaching the coils is substantially prevented.

llVhat l claim is:

l. r. magnetic chuck comprising two series ot pole pieces, an energizing electroi'nagnetic coil operatively mounted relatively to said pole pieces whereby when the coil is energized by a suitable electric current the pole pieces will be energized, and a hard insulating material separating the pole pieces oitl one series from the pole pieces ol? the other and completely surrounding and embedding the said coil.

2. A magnetic chuck comprising two series oi pole pieces, an energizing electromagnetic coil operatively mounted relatively to said pole pieces whereby when the coil is energized by a suitable electric current the pole pieces will be energized, and phenol condensation insulation separating the pole pieces ot one series from the pole pieces of the other and completely surrounding and embedding the said coil.

3. A magnetic chuck comprising two series ot poles pieces, an energizing electromagnetic coil operatively mounted relatively to said pole pieces whereby when the coil is energized by a suitable electric current the pole pieces will be energized, and a hard insulating material separatingthe pole pieces oit one series :trom the pole pieces ol2 the other and completely surrounding and embedding the said coil and supporting the terminals Yfor said coil.

l. A magnetic chuck comprising two series oiLI pole pieces, an energizing electromagnetic coil (meratively mounted relatively to said pole pieces whereby when the coil is energized by a suitable electric current the pole pieces will be energized, and a hard insulating material separating the pole pieces or. one series from the pole pieces of the other and completely surrounding and eu'ibedding the said coil, and a terminal box integral with said material.

53. A magnetic chuck comprising two series ol" pole pieces, an energizing electronnzgnetic coil operatively mounted relatively to said pole pieces whereby when the coil is energized by a suitable electric current the pole pieces will be energized, and a hard insulating material separating the pole pieces ot one series from the pole pieces of the other and completely surrounding and body.

7. A magnetic chuck comprising in combination a plurality of series oi pole pieces, electro-magnetic means for energizing the pole pieces, a housing 'for supporting the pole pieces, and a heat-hardened insulating material separating the pole pieces of one series from the other and completely filling all of the spaces within said housing whereby the body of said chuck comprises a substantially solid body.

8. A magnetic chuck comprising in combination a plurality ot series of pole pieces, electro-magnetic means for energizing the pole pieces, and an insulating material separating the pole pieces oli one series :trom the other and completely filling all of the spaces within said housing whereby ythe body of said chuck comprises a substantially solid body, and a back plate closing the back of said chuck.

9. A magnetic chuck comprising in combination a plurality ot sei ies of pole. pieces, electroanagnetic means for energizing the pole pieces, a housing for supporting the pole pieces, and an insulating material separating the pole pieces of one series from the other and completely filling allof the spaces Within said housing whereby the body of said chuck comprises a substantially solid body, and a back plate closing the back ol said chuck, said housing having an opening in a side wall, and a terminal box of said material extending through said openmg.

10. A magnetic chuck comprising a plurality of series of pole pieces, electro-magnetic means for energizing the pole pieces, a housing for supporting the pole pieces, and a heat-hardened insulating material separating the pole pieces oli one series from the other and completely filling all olI the spaces within said housing whereby the body of said chuck comprises a substantially solid body, and a back plate closing the back of said chuck, said housing having an opening in a side wall and a terminal boX of said material extending through said openin 0.

FRANK L. SIMMONS. 

